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344 lines
11 KiB
JavaScript
344 lines
11 KiB
JavaScript
12 years ago
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define("dojo/_base/array", ["./kernel", "../has", "./lang"], function(dojo, has, lang){
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// module:
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// dojo/_base/array
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// our old simple function builder stuff
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var cache = {}, u;
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function buildFn(fn){
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return cache[fn] = new Function("item", "index", "array", fn); // Function
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}
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// magic snippet: if(typeof fn == "string") fn = cache[fn] || buildFn(fn);
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// every & some
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function everyOrSome(some){
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var every = !some;
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return function(a, fn, o){
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var i = 0, l = a && a.length || 0, result;
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if(l && typeof a == "string") a = a.split("");
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if(typeof fn == "string") fn = cache[fn] || buildFn(fn);
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if(o){
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for(; i < l; ++i){
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result = !fn.call(o, a[i], i, a);
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if(some ^ result){
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return !result;
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}
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}
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}else{
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for(; i < l; ++i){
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result = !fn(a[i], i, a);
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if(some ^ result){
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return !result;
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}
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}
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}
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return every; // Boolean
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};
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}
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// indexOf, lastIndexOf
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function index(up){
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var delta = 1, lOver = 0, uOver = 0;
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if(!up){
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delta = lOver = uOver = -1;
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}
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return function(a, x, from, last){
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if(last && delta > 0){
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// TODO: why do we use a non-standard signature? why do we need "last"?
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return array.lastIndexOf(a, x, from);
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}
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var l = a && a.length || 0, end = up ? l + uOver : lOver, i;
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if(from === u){
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i = up ? lOver : l + uOver;
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}else{
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if(from < 0){
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i = l + from;
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if(i < 0){
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i = lOver;
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}
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}else{
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i = from >= l ? l + uOver : from;
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}
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}
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if(l && typeof a == "string") a = a.split("");
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for(; i != end; i += delta){
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if(a[i] == x){
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return i; // Number
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}
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}
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return -1; // Number
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};
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}
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var array = {
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// summary:
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// The Javascript v1.6 array extensions.
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every: everyOrSome(false),
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/*=====
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every: function(arr, callback, thisObject){
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// summary:
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// Determines whether or not every item in arr satisfies the
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// condition implemented by callback.
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// arr: Array|String
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// the array to iterate on. If a string, operates on individual characters.
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// callback: Function|String
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// a function is invoked with three arguments: item, index,
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// and array and returns true if the condition is met.
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// thisObject: Object?
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// may be used to scope the call to callback
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// returns: Boolean
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// description:
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// This function corresponds to the JavaScript 1.6 Array.every() method, with one difference: when
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// run over sparse arrays, this implementation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's every skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/every
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// example:
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// | // returns false
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// | array.every([1, 2, 3, 4], function(item){ return item>1; });
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// example:
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// | // returns true
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// | array.every([1, 2, 3, 4], function(item){ return item>0; });
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},
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=====*/
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some: everyOrSome(true),
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/*=====
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some: function(arr, callback, thisObject){
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// summary:
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// Determines whether or not any item in arr satisfies the
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// condition implemented by callback.
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// arr: Array|String
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// the array to iterate over. If a string, operates on individual characters.
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// callback: Function|String
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// a function is invoked with three arguments: item, index,
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// and array and returns true if the condition is met.
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// thisObject: Object?
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// may be used to scope the call to callback
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// returns: Boolean
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// description:
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// This function corresponds to the JavaScript 1.6 Array.some() method, with one difference: when
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// run over sparse arrays, this implementation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's some skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/some
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// example:
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// | // is true
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// | array.some([1, 2, 3, 4], function(item){ return item>1; });
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// example:
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// | // is false
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// | array.some([1, 2, 3, 4], function(item){ return item<1; });
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},
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=====*/
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indexOf: index(true),
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/*=====
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indexOf: function(arr, value, fromIndex, findLast){
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// summary:
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// locates the first index of the provided value in the
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// passed array. If the value is not found, -1 is returned.
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// description:
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// This method corresponds to the JavaScript 1.6 Array.indexOf method, with one difference: when
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// run over sparse arrays, the Dojo function invokes the callback for every index whereas JavaScript
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// 1.6's indexOf skips the holes in the sparse array.
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// For details on this method, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/indexOf
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// arr: Array
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// value: Object
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// fromIndex: Integer?
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// findLast: Boolean?
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// returns: Number
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},
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=====*/
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lastIndexOf: index(false),
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/*=====
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lastIndexOf: function(arr, value, fromIndex){
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// summary:
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// locates the last index of the provided value in the passed
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// array. If the value is not found, -1 is returned.
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// description:
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// This method corresponds to the JavaScript 1.6 Array.lastIndexOf method, with one difference: when
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// run over sparse arrays, the Dojo function invokes the callback for every index whereas JavaScript
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// 1.6's lastIndexOf skips the holes in the sparse array.
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// For details on this method, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/lastIndexOf
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// arr: Array,
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// value: Object,
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// fromIndex: Integer?
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// returns: Number
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},
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=====*/
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forEach: function(arr, callback, thisObject){
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// summary:
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// for every item in arr, callback is invoked. Return values are ignored.
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// If you want to break out of the loop, consider using array.every() or array.some().
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// forEach does not allow breaking out of the loop over the items in arr.
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// arr:
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// the array to iterate over. If a string, operates on individual characters.
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// callback:
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// a function is invoked with three arguments: item, index, and array
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// thisObject:
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// may be used to scope the call to callback
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// description:
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// This function corresponds to the JavaScript 1.6 Array.forEach() method, with one difference: when
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// run over sparse arrays, this implementation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's forEach skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/forEach
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// example:
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// | // log out all members of the array:
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// | array.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | function(item){
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// | console.log(item);
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// | }
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// | );
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// example:
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// | // log out the members and their indexes
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// | array.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | function(item, idx, arr){
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// | console.log(item, "at index:", idx);
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// | }
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// | );
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// example:
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// | // use a scoped object member as the callback
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// |
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// | var obj = {
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// | prefix: "logged via obj.callback:",
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// | callback: function(item){
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// | console.log(this.prefix, item);
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// | }
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// | };
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// |
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// | // specifying the scope function executes the callback in that scope
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// | array.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | obj.callback,
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// | obj
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// | );
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// |
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// | // alternately, we can accomplish the same thing with lang.hitch()
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// | array.forEach(
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// | [ "thinger", "blah", "howdy", 10 ],
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// | lang.hitch(obj, "callback")
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// | );
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// arr: Array|String
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// callback: Function|String
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// thisObject: Object?
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var i = 0, l = arr && arr.length || 0;
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if(l && typeof arr == "string") arr = arr.split("");
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if(typeof callback == "string") callback = cache[callback] || buildFn(callback);
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if(thisObject){
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for(; i < l; ++i){
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callback.call(thisObject, arr[i], i, arr);
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}
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}else{
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for(; i < l; ++i){
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callback(arr[i], i, arr);
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}
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}
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},
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map: function(arr, callback, thisObject, Ctr){
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// summary:
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// applies callback to each element of arr and returns
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// an Array with the results
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// arr: Array|String
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// the array to iterate on. If a string, operates on
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// individual characters.
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// callback: Function|String
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// a function is invoked with three arguments, (item, index,
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// array), and returns a value
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// thisObject: Object?
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// may be used to scope the call to callback
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// returns: Array
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// description:
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// This function corresponds to the JavaScript 1.6 Array.map() method, with one difference: when
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// run over sparse arrays, this implementation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's map skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
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// example:
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// | // returns [2, 3, 4, 5]
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// | array.map([1, 2, 3, 4], function(item){ return item+1 });
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// TODO: why do we have a non-standard signature here? do we need "Ctr"?
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var i = 0, l = arr && arr.length || 0, out = new (Ctr || Array)(l);
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if(l && typeof arr == "string") arr = arr.split("");
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if(typeof callback == "string") callback = cache[callback] || buildFn(callback);
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if(thisObject){
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for(; i < l; ++i){
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out[i] = callback.call(thisObject, arr[i], i, arr);
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}
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}else{
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for(; i < l; ++i){
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out[i] = callback(arr[i], i, arr);
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}
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}
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return out; // Array
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},
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filter: function(arr, callback, thisObject){
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// summary:
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// Returns a new Array with those items from arr that match the
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// condition implemented by callback.
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// arr: Array
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// the array to iterate over.
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// callback: Function|String
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// a function that is invoked with three arguments (item,
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// index, array). The return of this function is expected to
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// be a boolean which determines whether the passed-in item
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// will be included in the returned array.
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// thisObject: Object?
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// may be used to scope the call to callback
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// returns: Array
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// description:
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// This function corresponds to the JavaScript 1.6 Array.filter() method, with one difference: when
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// run over sparse arrays, this implementation passes the "holes" in the sparse array to
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// the callback function with a value of undefined. JavaScript 1.6's filter skips the holes in the sparse array.
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// For more details, see:
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// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
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// example:
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// | // returns [2, 3, 4]
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// | array.filter([1, 2, 3, 4], function(item){ return item>1; });
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// TODO: do we need "Ctr" here like in map()?
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var i = 0, l = arr && arr.length || 0, out = [], value;
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if(l && typeof arr == "string") arr = arr.split("");
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if(typeof callback == "string") callback = cache[callback] || buildFn(callback);
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if(thisObject){
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for(; i < l; ++i){
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value = arr[i];
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if(callback.call(thisObject, value, i, arr)){
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out.push(value);
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}
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}
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}else{
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for(; i < l; ++i){
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value = arr[i];
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if(callback(value, i, arr)){
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out.push(value);
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}
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}
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}
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return out; // Array
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},
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clearCache: function(){
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cache = {};
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}
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};
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1 && lang.mixin(dojo, array);
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return array;
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});
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